WarpTo

VTKExamples/Cxx/Filtering/WarpTo


Other Languages

See (Python), (Java)

Question

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Code

WarpTo.cxx

#include <vtkSmartPointer.h>
#include <vtkLineSource.h>
#include <vtkTubeFilter.h>
#include <vtkDataSetMapper.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkWarpTo.h>

int main(int, char*[])
{
  // Create the RenderWindow, Renderer and both Actors
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // Create a line
  vtkSmartPointer<vtkLineSource> lineSource = 
    vtkSmartPointer<vtkLineSource>::New();
  lineSource->SetPoint1(0.0, 0.0, 0.0);
  lineSource->SetPoint2(0.0, 1.0, 0.0);
  lineSource->SetResolution(20);
  lineSource->Update();

  // Create a tube (cylinder) around the line
  vtkSmartPointer<vtkTubeFilter> tubeFilter = 
    vtkSmartPointer<vtkTubeFilter>::New();
  tubeFilter->SetInputConnection(lineSource->GetOutputPort());
  tubeFilter->SetRadius(.01); //default is .5
  tubeFilter->SetNumberOfSides(50);
  tubeFilter->Update();

  vtkSmartPointer<vtkWarpTo> warpTo = 
    vtkSmartPointer<vtkWarpTo>::New();
  warpTo->SetInputConnection(tubeFilter->GetOutputPort());
  warpTo->SetPosition(10, 1, 0);
  warpTo->SetScaleFactor(5);
  warpTo->AbsoluteOn();

  vtkSmartPointer<vtkDataSetMapper> mapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
  mapper->SetInputConnection(warpTo->GetOutputPort());
  mapper->ScalarVisibilityOff();

  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  renderer->AddActor(actor);

  renderWindow->Render();
  renderWindowInteractor->Initialize();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(WarpTo)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkFiltersCore
  vtkFiltersGeneral
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping WarpTo: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(WarpTo MACOSX_BUNDLE WarpTo.cxx )
  target_link_libraries(WarpTo PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(WarpTo MACOSX_BUNDLE WarpTo.cxx )
  target_link_libraries(WarpTo PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS WarpTo
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build WarpTo

Click here to download WarpTo and its CMakeLists.txt file. Once the tarball WarpTo.tar has been downloaded and extracted,

cd WarpTo/build 

If VTK is installed:

cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

make

and run it:

./WarpTo

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.